| Manufacturer | John Deere |
| Price | 80,000(USD) |
| Model | 8640 |
| Equipment Type | Four-wheel Drive 4WD Tractors |
| Factory | Waterloo, Iowa, USA |
NEBRASKA TRACTOR TEST 1324 2
| Description | Diesel 16-speed 4WD September 11 - 18, 1979 Link: Nebraska Tractor Test 1324 file PTO performance Drawbar performance |
| Power at rated engine speed | 228.75hp / 170.6kW |
| Fuel use | 14.5gal/hour / 54.9l/hour |
| Max power | 203.34hp / 151.6kW |
| Max pull | 27,782lbs / 12601kg |
JOHN DEERE 8640 POWER
| Engine | 275hp / 205.1kW |
| PTO (claimed) | 225hp / 167.8kW |
| Drawbar (tested) | 203.34hp / 151.6kW |
| PTO (tested) | 228.75hp / 170.6kW |
ENGINE DETAIL
The John Deere 8640's robust 10.1L turbocharged diesel engine produces 275hp at a rated RPM of 2100, making it ideal for heavy-duty agricultural applications that require high torque. With its impressive dual paper air cleaner and a compression ratio of 15.2:1, it enhances combustion efficiency, though operators should be aware of the potential need for more frequent air filter changes in dusty conditions. The 26-quart oil capacity and 48-quart coolant capacity suggest a design conducive to extended oil change intervals, but careful monitoring of fluid levels remains crucial for optimal engine performance and longevity.
| Description | John Deere turbocharged diesel 6-cylinder liquid-cooled |
| Displacement | 619ci / 10.1L |
| Bore/Stroke | 5.12x5.00inches / 130x 127mm |
| Power | 275hp / 205.1kW |
| Air cleaner | dual paper elements |
| Compression | 15.2:1 |
| Rated RPM | 2100 |
| Idle RPM | 800-2300 |
| Operating RPM | 1500-2100 |
| Starter volts | 12 |
| Oil capacity | 26qts / 24.6L |
| Coolant capacity | 48qts / 45.4L |
JOHN DEERE 8640 ENGINE
The John Deere 8640 is powered by a robust 10.1L 6-cylinder diesel engine, providing high torque for heavy-duty applications, which is ideal for plowing and towing. However, its large displacement may lead to higher fuel consumption and greater emissions compared to smaller engines. Operators should consider balancing power needs with operating costs, especially in long-term agricultural scenarios.
| Description | John Deere 10.1L 6-cyl diesel |
TRANSMISSION
The John Deere 8640's Quad-Range transmission offers a robust 16 forward and 6 reverse gears, enabling versatility in varying terrain and tasks. However, the requirement to stop the tractor to change ranges may impact efficiency during operations that require frequent speed adjustments. The hydraulic wet disc clutch provides enhanced durability and smoother engagement, ideal for heavy-duty applications but necessitating consistent maintenance to ensure longevity.
| Transmission | John Deere Quad-Range |
| Type | partial power shift |
| Gears | 16 forward and 6 reverse |
| Clutch | hydraulic wet disc |
| Oil capacity | 164qts / 155.2L |
| Description | Four gears (1-4) in four ranges (A-D). Tractor must be stopped to select range. Power shift between gears 1-2 and 3-4 within range |
SPEEDS
| Description | With 18.4-38 tires |
MECHANICAL
The John Deere 8640 tractor features a robust 4x4 articulated chassis, providing superior traction and stability in diverse terrains, ideal for heavy-duty agricultural tasks. Its hydraulic differential lock enhances maneuverability, particularly in challenging conditions, while the 16-speed partial power shift transmission allows for optimized power management across various speeds. However, the articulated design may present a learning curve for operators unfamiliar with this configuration, and potential maintenance of hydraulic systems is critical for sustained performance.
| Chassis | 4x4 articulated 4WD |
| Differential lock | hydraulic front and rear |
| Steering | articulated power |
| Brakes | hydraulic wet disc |
| Cab | Cab standard |
| Transmission | 16-speed partial power shift |
CAPACITY
| Fuel | 214gal / 810.0L |
| Hydraulic system | 41gal / 155.2L |
HYDRAULICS
| Type | closed center |
| Capacity | 41gal / 155.2L |
| Valves | 2 |
| Pump flow | 33gpm / 124.9lpm |
TRACTOR HITCH
| Rear Type | III/IIIN |
| Rear lift | 8545lbs / 3876kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 1000 |
| Engine RPM | 1000@2100 |
JOHN DEERE 8640 TIRES
The John Deere 8640, equipped with uniform 18.4-34 Ag tires front and rear, provides excellent stability and traction on various terrains, making it ideal for heavy-duty agricultural tasks. This tire configuration enhances weight distribution and reduces soil compaction, but operators should monitor tire pressure and wear to maintain optimal performance. In scenarios requiring high horsepower for plowing or tilling, this setup offers a balance of power and maneuverability, ensuring effective field operations.
| Ag front | 18.4-34 |
| Ag rear | 18.4-34 |
DIMENSIONS
| Wheelbase | 125inches / 317cm |
| Length | 223.5inches / 567cm |
| Operating weight | 28,270lbs / 12823kg |
| Ground clearance | 18.4inches / 46cm |
| Front axle | Rack-and-pinion: 3.937 by 118.4inches / 99by 3007mm |
| Rear axle | Rack-and-pinion: 3.937 by 118.4inches / 99by 3007mm |
| Front tread | 63 to 130inches / 160to 330cm |
| Rear tread | 63 to 130inches / 160to 330cm |
JOHN DEERE 8640 HEIGHT
| Hood | 87.1inches / 221cm |
| Cab | 126.6inches / 321cm |
| Exhaust | 134.5inches / 341cm |
DIMENSIONS & TIRES
The John Deere 8640’s 125-inch wheelbase provides enhanced stability and maneuverability on varied terrains, making it suitable for both agricultural and heavy-duty applications. Weighing 28,270 lbs, its robust design allows for high traction and effective implement attachment, though it may limit road transport due to its size. Equipped with 18.4-34 tires, the tractor excels in traction on loose soil but may experience challenges in compaction and field ruts under excessive load.
| Wheelbase | 125inches / 317cm |
| Weight | 28,270lbs / 12823kg |
| Front tire | 18.4-34 |
| Rear tire | 18.4-34 |
8640 SERIAL NUMBERS
| Location | On the tractor transmission case, rear |
| 1979 | 1500 |
| 1980 | 3198 |
| 1981 | 5704 |
| 1982 | 7960 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 90 |
| Batteries | 2 |
| Battery CCA | 975 |
| Battery volts | 6 |